net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:527) [spigot.jar:git-Spigot-2038f4a-15222c8]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_60]
[21:01:54] [Server thread/WARN]: **** DETECTED OLD PLAYER DIRECTORY IN THE WORLD SAVE